From the Alan Guttmacher Institute, the research and education wing of Planned Parenthood:
Estimates of the number of illegal abortions in the 1950s and 1960s ranged from 200,000 to 1.2 million per year. One analysis, extrapolating from data from North Carolina, concluded that an estimated 829,000 illegal or self-induced abortions occurred in 1967.
One stark indication of the prevalence of illegal abortion was the death toll. In 1930, abortion was listed as the official cause of death for almost 2,700 womennearly one-fifth (18%) of maternal deaths recorded in that year. The death toll had declined to just under 1,700 by 1940, and to just over 300 by 1950 (most likely because of the introduction of antibiotics in the 1940s, which permitted more effective treatment of the infections that frequently developed after illegal abortion). By 1965, the number of deaths due to illegal abortion had fallen to just under 200, but illegal abortion still accounted for 17% of all deaths attributed to pregnancy and childbirth that year. And these are just the number that were officially reported; the actual number was likely much higher.
Poor women and their families were disproportionately impacted. A study of low-income women in New York City in the 1960s found that almost one in 10 (8%) had ever attempted to terminate a pregnancy by illegal abortion; almost four in 10 (38%) said that a friend, relative or acquaintance had attempted to obtain an abortion. Of the low-income women in that study who said they had had an abortion, eight in 10 (77%) said that they had attempted a self-induced procedure, with only 2% saying that a physician had been involved in any way.
These women paid a steep price for illegal procedures. In 1962 alone, nearly 1,600 women were admitted to Harlem Hospital Center in New York City for incomplete abortions, which was one abortion-related hospital admission for every 42 deliveries at that hospital that year. In 1968, the University of Southern California Los Angeles County Medical Center, another large public facility serving primarily indigent patients, admitted 701 women with septic abortions, one admission for every 14 deliveries.
fyi
Stats before Roe vs. Wade:
http://www.grtl.org/docs/roevwade.pdf - States that abortions went down 450,000 in 1973. So there is doubt about statistics re: the number of abortions before Roe vs. Wade, because why would there be 450,000 LESS abortions in that year when abortion became legal?